2 * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved.
3 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
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22 * provided with the distribution.
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30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 #include <linux/errno.h>
36 #include <linux/scatterlist.h>
37 #include <linux/slab.h>
39 #include <linux/mlx4/cmd.h>
46 * We allocate in as big chunks as we can, up to a maximum of 256 KB
50 MLX4_ICM_ALLOC_SIZE = 1 << 18,
51 MLX4_TABLE_CHUNK_SIZE = 1 << 18
54 static void mlx4_free_icm_pages(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk)
59 pci_unmap_sg(dev->pdev, chunk->mem, chunk->npages,
60 PCI_DMA_BIDIRECTIONAL);
62 for (i = 0; i < chunk->npages; ++i)
63 __free_pages(sg_page(&chunk->mem[i]),
64 get_order(chunk->mem[i].length));
67 static void mlx4_free_icm_coherent(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk)
71 for (i = 0; i < chunk->npages; ++i)
72 dma_free_coherent(&dev->pdev->dev, chunk->mem[i].length,
73 lowmem_page_address(sg_page(&chunk->mem[i])),
74 sg_dma_address(&chunk->mem[i]));
77 void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent)
79 struct mlx4_icm_chunk *chunk, *tmp;
84 list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
86 mlx4_free_icm_coherent(dev, chunk);
88 mlx4_free_icm_pages(dev, chunk);
96 static int mlx4_alloc_icm_pages(struct scatterlist *mem, int order,
97 gfp_t gfp_mask, int node)
101 page = alloc_pages_node(node, gfp_mask, order);
103 page = alloc_pages(gfp_mask, order);
108 sg_set_page(mem, page, PAGE_SIZE << order, 0);
112 static int mlx4_alloc_icm_coherent(struct device *dev, struct scatterlist *mem,
113 int order, gfp_t gfp_mask)
115 void *buf = dma_alloc_coherent(dev, PAGE_SIZE << order,
116 &sg_dma_address(mem), gfp_mask);
120 sg_set_buf(mem, buf, PAGE_SIZE << order);
122 sg_dma_len(mem) = PAGE_SIZE << order;
126 struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
127 gfp_t gfp_mask, int coherent)
129 struct mlx4_icm *icm;
130 struct mlx4_icm_chunk *chunk = NULL;
134 /* We use sg_set_buf for coherent allocs, which assumes low memory */
135 BUG_ON(coherent && (gfp_mask & __GFP_HIGHMEM));
137 icm = kmalloc_node(sizeof(*icm),
138 gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN),
141 icm = kmalloc(sizeof(*icm),
142 gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
148 INIT_LIST_HEAD(&icm->chunk_list);
150 cur_order = get_order(MLX4_ICM_ALLOC_SIZE);
154 chunk = kmalloc_node(sizeof(*chunk),
155 gfp_mask & ~(__GFP_HIGHMEM |
159 chunk = kmalloc(sizeof(*chunk),
160 gfp_mask & ~(__GFP_HIGHMEM |
166 sg_init_table(chunk->mem, MLX4_ICM_CHUNK_LEN);
169 list_add_tail(&chunk->list, &icm->chunk_list);
172 while (1 << cur_order > npages)
176 ret = mlx4_alloc_icm_coherent(&dev->pdev->dev,
177 &chunk->mem[chunk->npages],
178 cur_order, gfp_mask);
180 ret = mlx4_alloc_icm_pages(&chunk->mem[chunk->npages],
195 else if (chunk->npages == MLX4_ICM_CHUNK_LEN) {
196 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
198 PCI_DMA_BIDIRECTIONAL);
204 if (chunk->npages == MLX4_ICM_CHUNK_LEN)
207 npages -= 1 << cur_order;
210 if (!coherent && chunk) {
211 chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
213 PCI_DMA_BIDIRECTIONAL);
222 mlx4_free_icm(dev, icm, coherent);
226 static int mlx4_MAP_ICM(struct mlx4_dev *dev, struct mlx4_icm *icm, u64 virt)
228 return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM, icm, virt);
231 static int mlx4_UNMAP_ICM(struct mlx4_dev *dev, u64 virt, u32 page_count)
233 return mlx4_cmd(dev, virt, page_count, 0, MLX4_CMD_UNMAP_ICM,
234 MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
237 int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm)
239 return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM_AUX, icm, -1);
242 int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev)
244 return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_UNMAP_ICM_AUX,
245 MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
248 int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj)
250 u32 i = (obj & (table->num_obj - 1)) /
251 (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
254 mutex_lock(&table->mutex);
257 ++table->icm[i]->refcount;
261 table->icm[i] = mlx4_alloc_icm(dev, MLX4_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
262 (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
263 __GFP_NOWARN, table->coherent);
264 if (!table->icm[i]) {
269 if (mlx4_MAP_ICM(dev, table->icm[i], table->virt +
270 (u64) i * MLX4_TABLE_CHUNK_SIZE)) {
271 mlx4_free_icm(dev, table->icm[i], table->coherent);
272 table->icm[i] = NULL;
277 ++table->icm[i]->refcount;
280 mutex_unlock(&table->mutex);
284 void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj)
289 i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
291 mutex_lock(&table->mutex);
293 if (--table->icm[i]->refcount == 0) {
294 offset = (u64) i * MLX4_TABLE_CHUNK_SIZE;
295 mlx4_UNMAP_ICM(dev, table->virt + offset,
296 MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
297 mlx4_free_icm(dev, table->icm[i], table->coherent);
298 table->icm[i] = NULL;
301 mutex_unlock(&table->mutex);
304 void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj,
305 dma_addr_t *dma_handle)
307 int offset, dma_offset, i;
309 struct mlx4_icm_chunk *chunk;
310 struct mlx4_icm *icm;
311 struct page *page = NULL;
316 mutex_lock(&table->mutex);
318 idx = (u64) (obj & (table->num_obj - 1)) * table->obj_size;
319 icm = table->icm[idx / MLX4_TABLE_CHUNK_SIZE];
320 dma_offset = offset = idx % MLX4_TABLE_CHUNK_SIZE;
325 list_for_each_entry(chunk, &icm->chunk_list, list) {
326 for (i = 0; i < chunk->npages; ++i) {
327 if (dma_handle && dma_offset >= 0) {
328 if (sg_dma_len(&chunk->mem[i]) > dma_offset)
329 *dma_handle = sg_dma_address(&chunk->mem[i]) +
331 dma_offset -= sg_dma_len(&chunk->mem[i]);
334 * DMA mapping can merge pages but not split them,
335 * so if we found the page, dma_handle has already
338 if (chunk->mem[i].length > offset) {
339 page = sg_page(&chunk->mem[i]);
342 offset -= chunk->mem[i].length;
347 mutex_unlock(&table->mutex);
348 return page ? lowmem_page_address(page) + offset : NULL;
351 int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
354 int inc = MLX4_TABLE_CHUNK_SIZE / table->obj_size;
358 for (i = start; i <= end; i += inc) {
359 err = mlx4_table_get(dev, table, i);
369 mlx4_table_put(dev, table, i);
375 void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
380 for (i = start; i <= end; i += MLX4_TABLE_CHUNK_SIZE / table->obj_size)
381 mlx4_table_put(dev, table, i);
384 int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
385 u64 virt, int obj_size, u32 nobj, int reserved,
386 int use_lowmem, int use_coherent)
394 obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size;
395 num_icm = (nobj + obj_per_chunk - 1) / obj_per_chunk;
397 table->icm = kcalloc(num_icm, sizeof *table->icm, GFP_KERNEL);
401 table->num_icm = num_icm;
402 table->num_obj = nobj;
403 table->obj_size = obj_size;
404 table->lowmem = use_lowmem;
405 table->coherent = use_coherent;
406 mutex_init(&table->mutex);
408 size = (u64) nobj * obj_size;
409 for (i = 0; i * MLX4_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
410 chunk_size = MLX4_TABLE_CHUNK_SIZE;
411 if ((i + 1) * MLX4_TABLE_CHUNK_SIZE > size)
412 chunk_size = PAGE_ALIGN(size -
413 i * MLX4_TABLE_CHUNK_SIZE);
415 table->icm[i] = mlx4_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
416 (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
417 __GFP_NOWARN, use_coherent);
420 if (mlx4_MAP_ICM(dev, table->icm[i], virt + i * MLX4_TABLE_CHUNK_SIZE)) {
421 mlx4_free_icm(dev, table->icm[i], use_coherent);
422 table->icm[i] = NULL;
427 * Add a reference to this ICM chunk so that it never
428 * gets freed (since it contains reserved firmware objects).
430 ++table->icm[i]->refcount;
436 for (i = 0; i < num_icm; ++i)
438 mlx4_UNMAP_ICM(dev, virt + i * MLX4_TABLE_CHUNK_SIZE,
439 MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
440 mlx4_free_icm(dev, table->icm[i], use_coherent);
448 void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table)
452 for (i = 0; i < table->num_icm; ++i)
454 mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
455 MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
456 mlx4_free_icm(dev, table->icm[i], table->coherent);